In their IFC show “Portlandia,” Fred Armisen and Carrie Brownstein skewer residents of the Oregon city. But the pair, in town for “Portlandia: The Tour” this weekend, have ideas about whom they’d spoof should they ever have a show called “New Yorkia.” Armisen says he’d aim at “the Disney ride-like journey of taking the L train from 14th Street into Brooklyn.” Brownstein would target expensive SoHo boutiques — “the kind wherein you enter and immediately feel like you just ruined that employee’s day by coming in. Or you feel like your personal aesthetic is an affront to the store, so you apologize and back your way out the door.”